Paper-bag machine



(No Model.)

W. 0. GROSS.

' PAPER BAG MACHINE. No. 244,860. I "Patented July 26,1881.v

min ess's. fzf uaacan ' To all whom it may concern UNITED STATES PATENTOFFICE.

WILLIAM (J. CROSS, OF BOSTON, MASSACHUSETTS.

PAPER-BAG MACHINE.

SPECIFICATION forming part of Letters Patent No, 244,860, dated July 26,1881.

Application filed June 27, 1881. (No model.)

i Be it known that I, WILLIAMO. Oaoss, of

. Boston, Massachusetts, have invented certain new and usefulImprovements in Machines for Making Paper Bags, of which the followingis a specification. My invention relates to machines for makingsatchel-bottom paper bags. It consists in a certain improvement in theconstruction and arrangement of the devices for making the first ordiamond fold, which willbe hereinafter specifically pointed out.

It also consists in the hereinafter-described combination ofinstrumentalities, whereby I unfold and straighten out the completedbagat the point where a blind fold in the bag-body is in soinepaper-bagmachines formed at the time the finalfold of the satchel-bottom is made.I The nature of my invention and the manner in which thesame is .or maybe carried into effect will be understood by reference to theaccompanying drawings, in which Figure 1 is a side elevation of so muchof a satchel-bottom paper-bag machine as is needed to illustrate myinvention. Fig. 2 is a sectional view, on an enlarged scale,- of aportion of the diamond-fold-forming rolls. Fig. 3 is a plan of theportion of one of said rolls. r I have not deemed it necessary to showthe mechanisms for forming and pasting the flattened paper tube, forsevering the same into bag-lengths, and for feeding the blanks thusproduced to thefoldinginstrumentalities. Said mechanisms may be of anyapproved kind.

For the purpose of making the diamond-fold on the flattened tubularbag-blank I make use of rotatin gdiamond-fold-formin g rolls A, which Inow proceed to describe Said rolls are provided with nippers a, whichtake hold of the plies of the blank passing between them, andhold'themfor a certain period upon the moving diverging surfaces of therolls, thus spreading wide open the mouth end of the blank and puttingit in condition to have the diamondfold completed by passage of theblank betweenthe lower nipper-roll (on which it is retained by thenipper of that roll after it has been released by theother) and theupper one of the pair of power-driven rolls B, which, as indicated inFig. 1, carry along the diamondfolded blank to the subsequent foldingdevices. It is not new with me to form the diamond fold by the conjointaction of two diverging surfaces, nor is it broadly new to use nippersor. other-instrumentalities for the purpose of holding the plies on saidsurfaces; but there is novelty in the particular arrangement shown by mefor this purpose. The nipper-rolls are formed each with a centralshallow peripheral groove, b, intended to accommodate the light metallicspring opening fingers or strips 0, which extend from the trunk orformer 0 between the rolls to a point just beyond their bite, as shownin Fig. 2. These fingers at their free ends have a tendency to spreadapart, so that they will open the month end of the blank. 7

1n suitable recesses or pockets at in the rolls are mounted onrock-shafts a the nippers a, which are so placed that at one extreme oftheir movement (the movement in said direction being due to adjustablecams a fixed on the main frame, over which run the crank-arms a ofshafts a they will be contained in the recesses 11/, and at their otherextreme of movement (m'oiement in this direction being induced by theusual spring or springs when the nippers are released from the contactof their cams) their jaws or acting ends will overlap the edges of therecesses a and rest on the bottom of the shallow grooves 11, as shown inthe drawings. The nippers are so timed that they close, soon after theypass beyond the bite of the rolls, at a time when the month end of theblank x has just emerged from between the rolls and is opened by thespring-fingers. The nippers thus in closing will shut down each on theadjacent ply of the plank, and they, for this purpose, are forked, asshown in Fig. 3, so that they may close on the blank without interferingwith the opening-fingers 0. Under this arrangement I am enabled to takehold of the month end of the blank at a point just in ad- Vance of thebite of the rolls.

I am aware that curved spring opening-fingers passing between and beyondthe diamondfold-formin g rolls have been employed; but these fingershave been used in connection with ply-retaining devices which cannottake hold of the blank until its mouth-end has advanced aconsiderabledistance beyond the rolls and the plies have been laid partly around therolls,

, and for this reason, as well as for the further reason that it isnecessary under such an arrangement to get the fingers out of the wayafter they have performed their office as openers, said fingers havebeen arranged to reciprocate longitudinally. Under my improvement noreciprocation is needed. The fingers do not extend far enough forward toprevent the free passage of the blanks down around or partly around thelower roll; while by arranging the nippers as shown, and causing them tobe seated when closed in the grooves b, I am enabled to take the blankjust as it emerges from the bite of the rolls, and before its mouth, infact, gets beyond the fingers. The diamond-folded blank a is fed alongby the rolls B to the rolls D E, between which it passes. Roll E servesas the paste-roll, to deposit paste on parallel lines longitudinally ofthe diamond-fold in the usual way; and for this purpose it is providedwith paste -ridges supplied with paste from a paste-trough andintermediate roll in the ordinary manner. The diamond-folded and pastedblank passes beyond the roll E, and has the second and third foldsformed by the conjoint action of rolls D F G and vibratory tucker-bladesH I. These instrnmentalities for forming the second and third folds I donot here describe nor claim, inasmuch as I have made them the subject ofa separate application for Letters Patent filed in the United StatesPatent Oflice on the 26th day of March, 1881.

It is suflicient to say that, as indicated in Fig. l, a blind fold isformed in the body of the bag at the time the final fold is made by theconjoint action of the tucker I and the rolls A G. In order tostraighten out the bag after it passes these rolls, I employ thefollowing means, to wit: 1 place between the rolls and the endless apronJ and endless traveling tapes K(whieh convey the bags to and around thedrier and then discharge them from the machine) a curved guide anddeflecting plate, M, as shown clearly in Fig. 1. The tapes are set somedistance from the apron at the receiving end of the carrier, thusforming (as shown in the figure last referred to) a gradually-narrowingpassage, f. As the bag passes the rolls D G its blind-folded partnaturally opens somewhat; and when the bag, in descending, reaches theangle of junction between the plate M and the apron it strikes thatpoint along the line of its blind fold as seen in Fig. 1, and thisnaturally straightens out the bag a little more, throwing up at the sametime its front end into contact with the tapes, which carry along thatend in the gradually-narrowing passage f until the blank enters pointfirst between the contact portions of the tapes and apron. Travelingalong between these parts of the carrier it is straightened out andsmoothed, dried, and finally discharged from the machine.

The tapes and apron, except in the particular above noted, are arrangedin the usual manner, and are carried around the drier in the ordinaryway; and these parts therefore require no further description.

Having described my invention, what I claim, and desire to secure byLetters Patent,

1. The peripherally-grooved rotating diamond-tbld-torming rolls A, andthe vibratory nippers (1, carried by the same and operated to move atthe times and in the manner specified, in combination with the springopening fingers or strips 0, extending in the peripheral grooves I) andbeyond the bite of the rolls, under the arrangement and for operation asherein specified.

2. In combination with the final-folding rolls, the carrier apron andtapes arranged so that there shall be formed at the receiving end of thecarrier a gradually-narrowing passage, and the deflector or guideplateintermediate between the said apron andro1ls,with its front endadjoining and below the level of the rear end of the carrier-apron,substantially as and for the purposes hereinbefore shown and described.

In testimony whereof I have hereunto set my hand this 14th day ofJune,A. D. 1881.

WM. 0. GROSS.

Witnesses:

E. A. DICK, N. 0. LANE.

